Fig. 3
From: Patterned polymer matrix promotes stemness and cell-cell interaction of adult stem cells
Transverse sections of freestanding polymer fiber films. a Polymer fiber substrate overview showing the cut surface for transverse sections. b 2 × 2 polymer fiber substrate. c 2 × 3 polymer fiber substrate. d 4 × 4 polymer fiber substrate. e 5 × 5 polymer fiber substrate. f 7 × 7 polymer fiber substrate. Scale bars are 10 μm